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प्रश्न
Distinguish between Nonchordata and Chordata.
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उत्तर
| Nonchordates | Chordates |
| 1. Notochord is absent in them | 1. Notochord is present in them at some of their developmental stage. |
| 2. Their central nervous system is solid and ventral | 2. Their central nervous system is hollow and dorsal. |
| 3. Heart, if present in them, is dorsal in position. | 3. Heart is always present and it is ventral in position. |
| 4. Their circulatory system is of open or closed type. | 4. Their circulatory system is of closed type. |
| 5. Respiratory pigment, the haemoglobin, if present, is dissolved in plasma of blood. | 5. Haemoglobin is present in their red blood cells or corpuscles. |
| 6. Pharyngeal gill slits are absent in them. | 6. Pharyngeal gill-slits are present in them. |
| 7. They contain anus at posterior end of body, so post-anal tail is not present. | 7. Their anus is not located at posterior tip of body, so contain a post-anal tail. |
संबंधित प्रश्न
Match the following:
| Column I | Column II | ||
| (a) | Operculum | (i) | Ctenophora |
| (b) | Parapodia | (ii) | Mollusca |
| (c) | Scales | (iii) | Porifera |
| (d) | Comb plates | (iv) | Reptilia |
| (e) | Radula | (v) | Annelida |
| (f) | Hairs | (vi) | Cyclostomata and Chondrichthyes |
| (g) | Choanocytes | (vii) | Mammalia |
| (h) | Gill slits | (viii) | Osteichthyes |
Tick (✓) the appropriate answer:
Scientist who introduced binomial nomenclature is
Give one point of difference between notochord and nerve cord.
Write down four general characters of Porifera. Give two examples.
What are the group names of the following categories of animals?
Animals with a hairy skin ___________
Give any one difference between the following :
Flatworm and Roundworm
Given below is an animal followed by three terms or features. Underline the term which does not match with the animal.
Earthworm - Invertebrata, Annelida, Insecta
TYRANNOSAURUS
(One of the extinct animals which lived on the Earth about 100,000,000 years ago) Tyrannosaurus was about six meters long and it preyed upon other animals.
What do you think about its classification-was it an amphibian, a reptile or a mammal?
Can you call it a relative of Kangaroo? Yes/No. Give reason
Give the name of two animals that belong to phylum echinodermata.
Give two examples of each of the following: Annelida
Fill in the blanks:
The excretory organs of platyhelminthes are ______.
Fill in the blanks:
Bath sponge belongs to phylum ______.
Choose the correct answer: Mosquito is included in insects because
Choose the correct answer: Jelly-fish is classified in the phylum
Choose the correct answer: The animal of phylum mollusca is
Choose the correct answer: Multicellular producers are
The binomial name of onion is ______.
Assertion: Binomial name is the universal name and contains two names.
Reason: It was first introduced by Carolus Linnaeus
Write short notes on – Binomial Nomenclature.
Assertion (A): All vertebrates are chordates but all chordates are not vertebrate.
Reason (R): The members of subphylum vertebrata possess notochord, during the embryonic period, the notochord is replaced by a cartilaginous or bony vertebral column in adults.
In the light of the above statements, choose the correct answer from the options given below:
